Voltammetric studies of a novel bicopper complex modified glassy carbon electrode for the simultaneous determination of dopamine and ascorbic acid |
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Authors: | Mingyan Wang Xingyou Xu Jian Gao |
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Affiliation: | (1) Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu Province, 222005, China |
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Abstract: | A novel modified glassy carbon electrode (GCE) with a binuclear copper complex was fabricated using a cyclic voltammetric
method in phosphate buffer solution. This modified electrode shows very efficient electrocatalytic activity for anodic oxidation
of both dopamine (DA) and ascorbic acid (AA) via substantial decrease in anodic overpotentials for both compounds. Cyclic
voltammetry (CV) and differential pulse voltammetry (DPV) using this modified electrode show two well-resolved anodic waves
for the oxidation of DA and AA in mixed solution, which makes it possible for simultaneous determination of both compounds.
Linear analytical curves were obtained in the ranges 2.0–120.0 μM and 5.0–160.0 μM for DA and AA concentrations by using DPV
methods, respectively. The detection limits were 1.4 × 10−6 M of DA and 2.8 × 10−6 M of AA. This electrode was used for AA and DA determinations in medicine and foodstuff samples with satisfactory results. |
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Keywords: | Binuclear copper complex Modified electrode Determination Dopamine Ascorbic acid |
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